Quote:
Originally Posted by Adam_L
Well, any car manufacture can say to change the oil at a higher mileage interval 7500 miles, or 10,000 miles, etc. , but ultimately is that the best thing for the engine? Oil is the engines life blood.
Even with top end synthetic oil (Amsoil, Royal P, etc) , I'd trust that to go 6-8k miles, post 5k miles on the car.
Is it more expensive to replace the engine prematurely, or replace the oil at a shorter interval ? Do the math.  
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Well, back-in-the-day, my first road vehicle had only a by-pass type oil filter (which filtered only about 10% of the oil). I changed the oil once in the spring with 30W and once in the fall, with 20 W.
That car lasted me 14 years, without a major overhaul.
I truly believe that the manufacturers want their cars engines to last quite a while, therefore, their oil change recommendations reflect that.
Yes, I agree, that "oil is an engines life blood". Also, blood is the human body's "life blood" ...... but we don't go around getting blood transfusions all the time ....
humfrz